allow response status codes with curl

[Hampus]

I have a program that is using std.curl and right now if a http 
request returns a status code other than 200 the program will 
crash like this:

std.net.curl.HTTPStatusException at C:\D\dmd2\windows\bin\..\..\src\phobos\std\net\curl.d(1082): HTTP request returned status code 404 (Not Found)

What I want to do is allow certain stauts codes and I want my 
program to keep going if it receives for example 404 or 500 but 
raise an exception for lets say status code 403.

How do I achieve this?